Dendritic Opal Gemstone & Information | Gemopedia by JTV | Gemopedia™

Dendritic Opal

This opal variety is termed "dendritic" due to its internal collection of dendrites. Dendrites are fern-like inclusions of iron, manganese, or other metallic oxides that create bold patterns within the gem. Typically, dendritic opals are cut into slices to best exhibit nature's artwork. As you might guess, these pieces are one-of-a-kinds, as no two dendritic patterns are exactly the same. Usually these opals are white, yellow, blue, green or pink and show the black inclusions well.

Colors

White With Black Dendrite Inclusions

  • Dendritic-opal classification

    CommonName
    Dendritic Opal
    Species
    Opal
    Variety
    Dendritic Opal
    Colors
    White With Black Dendrite Inclusions
    AlternateNames
    GemstoneGroups
    KeySeparations
    Appearance, RI and fluorescence
    ClassificationComments
  • Dendritic-opal chemistry & crystallography

    ChemicalName
    hydrated silicon dioxide
    ChemicalFormula
    SiO2-nH2O
    Synthesis
    CrystalSystem
    NA
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Amorphous
    ChemistryComments
  • Dendritic-opal optical properties

    Transparency
    Translucent - Opaque
    Dispersion
    Strength: none
    OpticalComments
    RefractiveIndex
    1.37-1.52
    Birefringence
    OpticCharacter
    NA
    OpticSign
    PolariscopeReaction
    Singly Refractive (SR) With ADR
    Fluorescence
    SWUV:
    LWUV:
    CCFReaction
    Pleochroism
    None
  • Dendritic-opal characteristic physical properties

    Hardness
    5-6.5
    CharacteristicComments
    Streak
    White
    SpecificGravity
    1.98-2.5 Typical:2.15
    Toughness
    Varies
    Inclusions
    Dendritic opal is milk opal that has dendritic inclusions that look like moss or ferns.
    Luster
    Vitreous
    Stability
    Poor
    Fracture
    Conchoidal, Uneven
    Cleavage
    None